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For bugs in Firefox Desktop, the Mozilla Foundation's web browser. For Firefox user interface issues in menus, developer tools, bookmarks, location bar, and preferences. Many Firefox bugs will either be filed here or in the Core product. (more info)

(1 attachment)

Created attachment 8616475[details]
see.png
User Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:29.0) Gecko/20100101 Firefox/29.0
Build ID: 20150515071002
Steps to reproduce:
1) Download a WebM file without a question mark in the filename (any, to see the difference) -> for example, the "Chemise" one provided by the Dropbox link
2) Download a WebM file with a question mark in the filename -> for example, the "Charles" one provided by the Dropbox link
WebM files:
https://www.dropbox.com/sh/x7h3lyo1rncwqcl/AABPzzEtIkY489xUB6FEz1Kia?dl=0
Actual results:
In the downloads window / tab / overlay, there is a WebM icon (video icon) for the file without question mark. However, there is none (icon: unknown) for the one with a question mark. This is observed in Linux and can probably be reproduced on all operating systems that Firefox runs on.
Expected results:
The icon for both files should have been the video icon.

(In reply to Geoffrey Db from comment #0)
> This is observed in Linux and can probably be reproduced on all operating systems that Firefox runs on.
? is an illegal character in file names on Windows. It gets replaced with _ when downloading.